摘要
基于亥姆霍兹线圈中轴线中心点处的磁场,对霍尔效应及其副效应进行了深入研究,详细讨论了不等位效应、能斯特效应和里吉-勒迪克效应对测量结果的影响,其中不等位效应对测量结果影响很大,必须改变磁场的方向予以消除;斯特效应和里吉-勒迪克效应对测量结果影响较小,须从理论上讲清机理,没有必要刻意去消除。进一步推导出了真空磁导率的实验公式,并实验测量了真空磁导率在保留4位有效数字时的近似值,结果与理论值的相对误差为0. 08%。
Based on the magnetic field at the center axis of the Helmholtz coil,the Hall effect and its side effects are studied in depth. The effects of the Unequal effect,the Nernst effect and the Righi-Leduc effect on the measurement results are discussed in detail. The Unequal effect has a great influence on the measurement results,and the direction of the magnetic field must be changed to eliminate it;the Nernst effect and the Righi-Leduc effect have little effect on the measurement results,and it is necessary to theoretically explain the mechanism,and it is not necessary to deliberately eliminate. The experimental formula of vacuum permeability is further derived,and the approximate value of vacuum permeability when retaining 4 significant digits is experimentally measured. The relative error between the result and the theoretical value is 0. 08%.
作者
张晓旭
王彤
吴天安
ZHANG Xiaoxu;WANG Tong;WU Tianan(Basic Department,Information Engineering University,Zhengzhou,Henan,450001,China;Zheng Zhou Feng Yang Foreign Language School,Zhengzhou,Henan,450001,China)
出处
《实验科学与技术》
2019年第5期99-101,共3页
Experiment Science and Technology
